linux-kernel - Re: [PATCH v4 3/3] Documentation: of: Document graph bindings

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Date:	Tue, 11 Mar 2014 14:47:14 +0100
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>,
	Grant Likely <grant.likely@...aro.org>,
	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH v4 3/3] Documentation: of: Document graph bindings

On 10/03/14 07:53, Tomi Valkeinen wrote:
> On 08/03/14 14:25, Grant Likely wrote:
> 
>> Sure. If endpoints are logical, then only create the ones actually
>> hooked up. No problem there. But nor do I see any issue with having
>> empty connections if the board author things it makes sense to have them
>> in the dtsi.
> 
> I don't think they are usually logical, although they probably might be
> in some cases.

The endpoint nodes are supposed to be logical, they just group properties
describing a port's configuration.

> As I see it, a "port" is a group of pins in a hardware component, and
> two endpoints define a connection between two ports, which on the HW
> level are the wires between the ports.
> 
> So a port with two endpoints is a group of pins, with wires that go from
> the same pins to two different components.

It could be approximated like this, but I don't think it is needed.
I would rather stay with only port nodes mapped to hardware and the
endpoint nodes logical.

--
Regards,
Sylwester
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